Detections
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IP Forwarding Enabled

medium Nessus Plugin ID 50686

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Synopsis

The remote host has IP forwarding enabled.

Description

The remote host has IP forwarding enabled. An attacker can exploit this to route packets through the host and potentially bypass some firewalls / routers / NAC filtering.

Unless the remote host is a router, it is recommended that you disable IP forwarding.

Solution

On Linux, you can disable IP forwarding by doing :

echo 0 > /proc/sys/net/ipv4/ip_forward

On Windows, set the key 'IPEnableRouter' to 0 under

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters

On Mac OS X, you can disable IP forwarding by executing the command :

sysctl -w net.inet.ip.forwarding=0

For other systems, check with your vendor.

Plugin Details

Severity: Medium

ID: 50686

File Name: ip_forwarding_enabled.nasl

Version: 1.16

Type: remote

Family: Firewalls

Published: 11/23/2010

Updated: 10/17/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Vector: CVSS2#AV:A/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-1999-0511

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Vector: CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

Vulnerability Information

Vulnerability Publication Date: 1/1/1997

Reference Information

CVE: CVE-1999-0511